Modern society lends itself to an increasingly busy schedule, and the only way to successfully mitigate this schedule is through using powerful calendar software. The cost of such software sometimes leads people to avoid switching over to an electronic calendar, but the best calendar software is already free.One of the best online calendar options is Google Calendar. The advantage of this
. calendar is that it is completely online, which allows users to access the calendar from any computer at any time. Scheduling activities requires nothing more than a simple click. Users can combine several calendars on one account so that work and personal calendars are accessible in one location. Popular electronic devices, such as smart phone and tablets, automatically download calendar information from Google Calendar.Another popular calendar option comes from Mozilla, and is titled Sunbird. This application functions in a similar style as Google Calendar, but it is downloaded instead of running online. The popularity of this calendar largely rests in the open software coding employed. It is the perfect option for those using a Linux operating system or those who desire an added degree of control over the interface and functions of the calendar. The downside is that it is more difficult to sync this calendar with portable devices.The most popular calendar program, and the one that Google Calendar and Sunbird are largely copying, is iCal. This is only available on Apple devices, such as Apple computers, iPhone's or iPad's. The user interface is the most beautiful and operates smoothly. It is easily synced between Apple devices. The downside, of course, is that it only works on Apple products.Several calendar programs are available that meet common needs. The good news is that most of these programs are free. Finding the right calendar software requires testing the software, but most of the decision depends upon the computer system in use.